prosody
ceaa3cebf28b
plugins/mod_carbons.lua

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plugins/mod_carbons.lua @ 11328:ceaa3cebf28b

mod_http_file_share: Add support for removing old files (default 2 weeks)
author Kim Alvefur <zash@zash.se>
date Wed, 27 Jan 2021 22:09:26 +0100
parent 11260:08b397c21805
child 11796:71c20650a0b4
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 -- XEP-0280: Message Carbons implementation for Prosody
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2be85cb3bc66 mod_carbons: Make the conditions for ignoring MUC PMs more specific (fixes #744)
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2 -- Copyright (C) 2011-2016 Kim Alvefur
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3 --
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4 -- This file is MIT/X11 licensed.
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5
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6 local st = require "util.stanza";
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7 local jid_bare = require "util.jid".bare;
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8 local jid_resource = require "util.jid".resource;
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9 local xmlns_carbons = "urn:xmpp:carbons:2";
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10 local xmlns_forward = "urn:xmpp:forward:0";
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11 local full_sessions, bare_sessions = prosody.full_sessions, prosody.bare_sessions;
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12
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13 local function is_bare(jid)
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14 return not jid_resource(jid);
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15 end
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16
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17 local function toggle_carbons(event)
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18 local origin, stanza = event.origin, event.stanza;
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19 local state = stanza.tags[1].name;
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20 module:log("debug", "%s %sd carbons", origin.full_jid, state);
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21 origin.want_carbons = state == "enable" and stanza.tags[1].attr.xmlns;
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22 origin.send(st.reply(stanza));
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23 return true;
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24 end
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25 module:hook("iq-set/self/"..xmlns_carbons..":disable", toggle_carbons);
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26 module:hook("iq-set/self/"..xmlns_carbons..":enable", toggle_carbons);
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27
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28 local function should_copy(stanza, c2s, user_bare) --> boolean, reason: string
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29 local st_type = stanza.attr.type or "normal";
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30 if stanza:get_child("private", xmlns_carbons) then
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31 return false, "private";
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32 end
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33
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34 if stanza:get_child("no-copy", "urn:xmpp:hints") then
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35 return false, "hint";
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36 end
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37
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38 if not c2s and stanza.attr.to ~= user_bare and stanza:get_child("x", "http://jabber.org/protocol/muc#user") then
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39 -- MUC PMs are normally sent to full JIDs
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40 return false, "muc-pm";
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41 end
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42
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43 if st_type == "chat" then
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44 return true, "type";
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45 end
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46
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47 if st_type == "normal" and stanza:get_child("body") then
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48 return true, "type";
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49 end
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50
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51 -- Normal outgoing chat messages are sent to=bare JID. This clause should
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52 -- match the error bounces from those, which would have from=bare JID and
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53 -- be incoming (not c2s).
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54 if st_type == "error" and not c2s and is_bare(stanza.attr.from) then
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55 return true, "bounce";
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56 end
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57
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58 if stanza:get_child(nil, "urn:xmpp:jingle-message:0") then
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59 -- XXX Experimental XEP
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60 return true, "jingle call";
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61 end
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62
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63 for archived in stanza:childtags("stanza-id", "urn:xmpp:sid:0") do
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64 if archived and archived.attr.by == user_bare then
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65 return true, "archived";
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66 end
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67 end
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68
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69 return false, "default";
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70 end
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71
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72 local function message_handler(event, c2s)
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73 local origin, stanza = event.origin, event.stanza;
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74 local orig_type = stanza.attr.type or "normal";
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75 local orig_from = stanza.attr.from;
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76 local bare_from = jid_bare(orig_from);
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77 local orig_to = stanza.attr.to;
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78 local bare_to = jid_bare(orig_to);
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79
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80 -- Stanza sent by a local client
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81 local bare_jid = bare_from; -- JID of the local user
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82 local target_session = origin;
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83 local top_priority = false;
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84 local user_sessions = bare_sessions[bare_from];
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85
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86 -- Stanza about to be delivered to a local client
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87 if not c2s then
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88 bare_jid = bare_to;
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89 target_session = full_sessions[orig_to];
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90 user_sessions = bare_sessions[bare_jid];
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91 if not target_session and user_sessions then
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92 -- The top resources will already receive this message per normal routing rules,
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93 -- so we are going to skip them in order to avoid sending duplicated messages.
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94 local top_resources = user_sessions.top_resources;
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95 top_priority = top_resources and top_resources[1].priority
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96 end
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97 end
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98
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99 if not user_sessions then
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100 module:log("debug", "Skip carbons for offline user");
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101 return -- No use in sending carbons to an offline user
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102 end
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103
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104 local should, why = should_copy(stanza, c2s, bare_jid);
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105
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106 if not should then
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107 module:log("debug", "Not copying stanza: %s (%s)", stanza:top_tag(), why);
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108 if why == "private" and not c2s then
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109 stanza:maptags(function(tag)
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110 if not ( tag.attr.xmlns == xmlns_carbons and tag.name == "private" ) then
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111 return tag;
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112 end
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113 end);
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114 end
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115 return;
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116 end
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117
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118 local carbon;
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119 user_sessions = user_sessions and user_sessions.sessions;
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120 for _, session in pairs(user_sessions) do
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121 -- Carbons are sent to resources that have enabled it
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122 if session.want_carbons
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123 -- but not the resource that sent the message, or the one that it's directed to
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124 and session ~= target_session
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125 -- and isn't among the top resources that would receive the message per standard routing rules
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126 and (c2s or session.priority ~= top_priority) then
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127 if not carbon then
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128 -- Create the carbon copy and wrap it as per the Stanza Forwarding XEP
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129 local copy = st.clone(stanza);
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130 if c2s and not orig_to then
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131 stanza.attr.to = bare_from;
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132 end
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133 copy.attr.xmlns = "jabber:client";
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134 carbon = st.message{ from = bare_jid, type = orig_type, }
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135 :tag(c2s and "sent" or "received", { xmlns = xmlns_carbons })
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136 :tag("forwarded", { xmlns = xmlns_forward })
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137 :add_child(copy):reset();
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138
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139 end
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140
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141 carbon.attr.to = session.full_jid;
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142 module:log("debug", "Sending carbon to %s", session.full_jid);
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143 session.send(carbon);
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144 end
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145 end
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146 end
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147
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148 local function c2s_message_handler(event)
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149 return message_handler(event, true)
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150 end
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151
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152 -- Stanzas sent by local clients
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153 module:hook("pre-message/host", c2s_message_handler, -0.5);
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154 module:hook("pre-message/bare", c2s_message_handler, -0.5);
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155 module:hook("pre-message/full", c2s_message_handler, -0.5);
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156 -- Stanzas to local clients
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157 module:hook("message/bare", message_handler, -0.5);
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158 module:hook("message/full", message_handler, -0.5);
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159
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160 module:add_feature(xmlns_carbons);